Bootcamp performance drops after installing Bigsur (Irreversible)

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Bootcamp performance drops after installing Bigsur (Irreversible)

Hello guys, does anybody got slowed down Bootcamp performance after updating from Catalina -> Big Sur? Not only on gaming, but overall Windows 10 performance! For example, it takes longer to open/install programs etc. After googling around, I realized that big sur has a problem with Bootcamp, so I downgraded my OS back to Catalina by using a bootable installer on my external hard disk that was downloaded from the official Windows website. After the process, all of my mac's data was erased so it started from 0 again like new.

After successfully re-installing Catalina OS again, I installed windows 10 on bootcamp, and install the AMD driver from bootcampdriver.com too. But the performance issue didn't change that much, bottom line is my mac didn't run as smooth as before I installed Big Sur, even after I uninstalled it!

I tried to find a solution on google. Some said it's a problem of a bad windows 10 update ( KB5001330 and KB5001337 ) so I remove the update, and others said there's a malware/virus, so I downloaded malware bytes to remove those. Tried both solutions, but the performance still isn't getting better. (especially low fps on gaming)

Is my bootcamp permanently damaged or something because of Big Sur? I'm sure that disk space won't be an issue, since all of my data was erased after reinstalling the OS. So it doesn't make sense now that my mac has full free space, but it runs slower than before.

Please kindly help me solve this issue, I miss playing games and using windows on mac with good performance.

Thank you before!

PS: I'm using 2019 iMac, 27inch, 8gb ram, 2tb hdd, 5k. intel-core i5.

iMac 27″, macOS 10.15

Posted on Apr 26, 2021 12:51 AM

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Answer 1

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agyabuwana Author

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Apr 27, 2021 4:09 AM in response to agyabuwana

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Answer 2

agyabuwana Author

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Apr 27, 2021 9:41 AM in response to agyabuwana

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Answer 3

Loner T

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59,536 points

Apr 27, 2021 6:15 PM in response to agyabuwana

You have a regular 2TB Fusion drive which consists of a 120GB SSD + 2TB HDD. The HDD is an Apple OEM Seagate 7200rpm mechanical disk, which will be slower than a SSD. Once Windows is fully booted, and you let it finish the initial startup, is it still slow?

If you need to go back to Catalina as a test, you will need to run resetFusion as explained in How to fix a split Fusion Drive - Apple Support. This will wipe all your data on both disks, so make good backups, if you choose to pursue this path.

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Answer 4

Loner T

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59,536 points

Apr 26, 2021 4:06 PM in response to agyabuwana

Can you post the output of

diskutil list

from macOS Terminal, before you erase any partitions/volumes?

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Answer 5

Loner T

Level 9

59,536 points

Apr 26, 2021 11:56 PM in response to agyabuwana

Start a new Terminal window, and post the output of

diskutil list

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Answer 6

Loner T

Level 9

59,536 points

Apr 28, 2021 5:08 AM in response to agyabuwana

This is normal in macOS Catalina. See About the read-only system volume in macOS Catalina - Apple Support for reference. Can you check Windows Task Manager and look at running processes? Your issue may be unrelated to the disk. Do you have any third-party AV software installed?

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Answer 7

Loner T

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59,536 points

Apr 27, 2021 6:13 AM in response to agyabuwana

Can you post the output of

diskutil info disk1

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Answer 8

agyabuwana Author

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Apr 27, 2021 4:07 AM in response to Loner T

Okay got it, here is the result sir. Is this normal?

diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk2 121.0 GB disk0s2

/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *2.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_APFS Container disk2 1.5 TB disk1s2

3: Microsoft Basic Data BOOTCAMP 504.2 GB disk1s3

/dev/disk2 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +1.6 TB disk2

Physical Stores disk0s2, disk1s2

1: APFS Volume Macintosh HD - Data ... 37.2 GB disk2s1

2: APFS Volume Preboot 101.0 MB disk2s2

3: APFS Volume Recovery 529.0 MB disk2s3

4: APFS Volume VM 2.1 GB disk2s4

5: APFS Volume Macintosh HD - Data 11.1 GB disk2s7

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Answer 9

Loner T

Level 9

59,536 points

Apr 26, 2021 6:05 AM in response to agyabuwana

From https://www.macworld.co.uk/how-to/clean-install-macos-3637409/, this

Select your Mac's start up disc, probably called Macintosh HD or Home.

is incorrect. You need to erase the complete physical drive.

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Answer 10

Loner T

Level 9

59,536 points

Apr 27, 2021 3:09 AM in response to agyabuwana

This is normal.

Type

diskutil list

and press Enter/Return.

You should get output similar to

diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         218.7 GB   disk0s2
   3:       Microsoft Basic Data                         31.8 GB    disk0s3
   4:                 Apple_Boot Boot OS X               134.2 MB   disk0s4

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +218.7 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD - Data     65.9 GB    disk1s1
   2:                APFS Volume Preboot                 84.4 MB    disk1s2
   3:                APFS Volume Recovery                528.9 MB   disk1s3
   4:                APFS Volume VM                      8.6 GB     disk1s4
   5:                APFS Volume Macintosh HD            11.2 GB    disk1s5

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Answer 11

Loner T

Level 9

59,536 points

Apr 30, 2021 9:15 AM in response to agyabuwana

Create a Windows System Restore point, before you update GPU drivers.

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Answer 12

agyabuwana Author

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Apr 26, 2021 5:45 AM in response to Loner T

Yes, I did sir, because I did not know I had any choice besides erasing the whole thing to reinstall it. I followed the OS downgrade tutorial on youtube and this page: https://www.macworld.co.uk/how-to/bootable-mac-installer-3575875/

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Answer 13

agyabuwana Author

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Apr 27, 2021 9:39 AM in response to Loner T

Here it is sir

% diskutil info disk1

Device Identifier: disk1

Device Node: /dev/disk1

Whole: Yes

Part of Whole: disk1

Device / Media Name: APPLE HDD ST2000DM001

Volume Name: Not applicable (no file system)

Mounted: Not applicable (no file system)

File System: None

Content (IOContent): GUID_partition_scheme

OS Can Be Installed: No

Media Type: Generic

Protocol: SATA

SMART Status: Verified

Disk Size: 2.0 TB (2000398934016 Bytes) (exactly 3907029168 512-Byte-Units)

Device Block Size: 512 Bytes

Read-Only Media: No

Read-Only Volume: Not applicable (no file system)

Device Location: Internal

Removable Media: Fixed

Solid State: No

Virtual: No

Hardware AES Support: No

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Answer 14

agyabuwana Author

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Apr 27, 2021 10:53 PM in response to Loner T

Yes it is still slow.

Now I just reinstalled Catalina again after following the instruction of fixing the split fusion drive you mentioned above. However in disk utility, it is still shown as 2 Macintosh HD Data instead of 1?

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Answer 15

agyabuwana Author

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Apr 28, 2021 3:46 PM in response to Loner T

I just reinstalled Catalina again, so I have no apps installed yet on my mac. I ran task manager and saw a lot of apps running in the background. 45 apps in background processes, 91 in windows processes, is this normal?

By the way, you mentioned before that I should erase the complete physical drive not only Macintosh HD. I haven't done that yet, should I try it?

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Bootcamp performance drops after installing Bigsur (Irreversible)

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